Intel® MPI Library Developer Reference for Linux* OS

ID 768732
Date 3/22/2024
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

Communication Fabrics Control

I_MPI_FABRICS

Select the particular fabrics to be used.

Syntax

I_MPI_FABRICS=ofi | shm:ofi | shm

Arguments

<fabric> Define a network fabric.
shm Shared memory transport (used for intra-node communication only).
ofi OpenFabrics Interfaces* (OFI)-capable network fabrics, such as Intel® Omni-Path Architecture, InfiniBand*, and Ethernet (through OFI API).

Description

Set this environment variable to select a specific fabric combination.

The default values are shm:ofi for the regular mode and ofi for the multiple endpoints mode. In the multiple endpoints mode, the default value ofi cannot be changed.

NOTE:

This option is not applicable to slurm and pdsh bootstrap servers.

NOTE:

DAPL, TMI, and OFA fabrics are deprecated.